[RT2x00]: add driver for Ralink wireless hardware

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 331 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
new file mode 100644
index 000000000000..4d2aaecd9dfe
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -0,0 +1,331 @@
+/*
+	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the
+	Free Software Foundation, Inc.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: rt2x00lib
+	Abstract: rt2x00 debugfs specific routines.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00lib"
+
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+#define PRINT_LINE_LEN_MAX 32
+
+struct rt2x00debug_intf {
+	/*
+	 * Pointer to driver structure where
+	 * this debugfs entry belongs to.
+	 */
+	struct rt2x00_dev *rt2x00dev;
+
+	/*
+	 * Reference to the rt2x00debug structure
+	 * which can be used to communicate with
+	 * the registers.
+	 */
+	const struct rt2x00debug *debug;
+
+	/*
+	 * Debugfs entries for:
+	 * - driver folder
+	 * - driver file
+	 * - chipset file
+	 * - register offset/value files
+	 * - eeprom offset/value files
+	 * - bbp offset/value files
+	 * - rf offset/value files
+	 */
+	struct dentry *driver_folder;
+	struct dentry *driver_entry;
+	struct dentry *chipset_entry;
+	struct dentry *csr_off_entry;
+	struct dentry *csr_val_entry;
+	struct dentry *eeprom_off_entry;
+	struct dentry *eeprom_val_entry;
+	struct dentry *bbp_off_entry;
+	struct dentry *bbp_val_entry;
+	struct dentry *rf_off_entry;
+	struct dentry *rf_val_entry;
+
+	/*
+	 * Driver and chipset files will use a data buffer
+	 * that has been created in advance. This will simplify
+	 * the code since we can use the debugfs functions.
+	 */
+	struct debugfs_blob_wrapper driver_blob;
+	struct debugfs_blob_wrapper chipset_blob;
+
+	/*
+	 * Requested offset for each register type.
+	 */
+	unsigned int offset_csr;
+	unsigned int offset_eeprom;
+	unsigned int offset_bbp;
+	unsigned int offset_rf;
+};
+
+static int rt2x00debug_file_open(struct inode *inode, struct file *file)
+{
+	struct rt2x00debug_intf *intf = inode->i_private;
+
+	file->private_data = inode->i_private;
+
+	if (!try_module_get(intf->debug->owner))
+		return -EBUSY;
+
+	return 0;
+}
+
+static int rt2x00debug_file_release(struct inode *inode, struct file *file)
+{
+	struct rt2x00debug_intf *intf = file->private_data;
+
+	module_put(intf->debug->owner);
+
+	return 0;
+}
+
+#define RT2X00DEBUGFS_OPS_READ(__name, __format, __type)	\
+static ssize_t rt2x00debug_read_##__name(struct file *file,	\
+					 char __user *buf,	\
+					 size_t length,		\
+					 loff_t *offset)	\
+{								\
+	struct rt2x00debug_intf *intf =	file->private_data;	\
+	const struct rt2x00debug *debug = intf->debug;		\
+	char line[16];						\
+	size_t size;						\
+	__type value;						\
+								\
+	if (*offset)						\
+		return 0;					\
+								\
+	if (intf->offset_##__name >= debug->__name.word_count)	\
+		return -EINVAL;					\
+								\
+	debug->__name.read(intf->rt2x00dev,			\
+			   intf->offset_##__name, &value);	\
+								\
+	size = sprintf(line, __format, value);			\
+								\
+	if (copy_to_user(buf, line, size))			\
+		return -EFAULT;					\
+								\
+	*offset += size;					\
+	return size;						\
+}
+
+#define RT2X00DEBUGFS_OPS_WRITE(__name, __type)			\
+static ssize_t rt2x00debug_write_##__name(struct file *file,	\
+					  const char __user *buf,\
+					  size_t length,	\
+					  loff_t *offset)	\
+{								\
+	struct rt2x00debug_intf *intf =	file->private_data;	\
+	const struct rt2x00debug *debug = intf->debug;		\
+	char line[16];						\
+	size_t size;						\
+	__type value;						\
+								\
+	if (*offset)						\
+		return 0;					\
+								\
+	if (!capable(CAP_NET_ADMIN))				\
+		return -EPERM;					\
+								\
+	if (intf->offset_##__name >= debug->__name.word_count)	\
+		return -EINVAL;					\
+								\
+	if (copy_from_user(line, buf, length))			\
+		return -EFAULT;					\
+								\
+	size = strlen(line);					\
+	value = simple_strtoul(line, NULL, 0);			\
+								\
+	debug->__name.write(intf->rt2x00dev,			\
+			    intf->offset_##__name, value);	\
+								\
+	*offset += size;					\
+	return size;						\
+}
+
+#define RT2X00DEBUGFS_OPS(__name, __format, __type)		\
+RT2X00DEBUGFS_OPS_READ(__name, __format, __type);		\
+RT2X00DEBUGFS_OPS_WRITE(__name, __type);			\
+								\
+static const struct file_operations rt2x00debug_fop_##__name = {\
+	.owner		= THIS_MODULE,				\
+	.read		= rt2x00debug_read_##__name,		\
+	.write		= rt2x00debug_write_##__name,		\
+	.open		= rt2x00debug_file_open,		\
+	.release	= rt2x00debug_file_release,		\
+};
+
+RT2X00DEBUGFS_OPS(csr, "0x%.8x\n", u32);
+RT2X00DEBUGFS_OPS(eeprom, "0x%.4x\n", u16);
+RT2X00DEBUGFS_OPS(bbp, "0x%.2x\n", u8);
+RT2X00DEBUGFS_OPS(rf, "0x%.8x\n", u32);
+
+static struct dentry *rt2x00debug_create_file_driver(const char *name,
+						     struct rt2x00debug_intf
+						     *intf,
+						     struct debugfs_blob_wrapper
+						     *blob)
+{
+	char *data;
+
+	data = kzalloc(3 * PRINT_LINE_LEN_MAX, GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	blob->data = data;
+	data += sprintf(data, "driver: %s\n", intf->rt2x00dev->ops->name);
+	data += sprintf(data, "version: %s\n", DRV_VERSION);
+	data += sprintf(data, "compiled: %s %s\n", __DATE__, __TIME__);
+	blob->size = strlen(blob->data);
+
+	return debugfs_create_blob(name, S_IRUGO, intf->driver_folder, blob);
+}
+
+static struct dentry *rt2x00debug_create_file_chipset(const char *name,
+						      struct rt2x00debug_intf
+						      *intf,
+						      struct
+						      debugfs_blob_wrapper
+						      *blob)
+{
+	const struct rt2x00debug *debug = intf->debug;
+	char *data;
+
+	data = kzalloc(4 * PRINT_LINE_LEN_MAX, GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	blob->data = data;
+	data += sprintf(data, "csr length: %d\n", debug->csr.word_count);
+	data += sprintf(data, "eeprom length: %d\n", debug->eeprom.word_count);
+	data += sprintf(data, "bbp length: %d\n", debug->bbp.word_count);
+	data += sprintf(data, "rf length: %d\n", debug->rf.word_count);
+	blob->size = strlen(blob->data);
+
+	return debugfs_create_blob(name, S_IRUGO, intf->driver_folder, blob);
+}
+
+void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
+{
+	const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
+	struct rt2x00debug_intf *intf;
+
+	intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
+	if (!intf) {
+		ERROR(rt2x00dev, "Failed to allocate debug handler.\n");
+		return;
+	}
+
+	intf->debug = debug;
+	intf->rt2x00dev = rt2x00dev;
+	rt2x00dev->debugfs_intf = intf;
+
+	intf->driver_folder =
+	    debugfs_create_dir(intf->rt2x00dev->ops->name,
+			       rt2x00dev->hw->wiphy->debugfsdir);
+	if (IS_ERR(intf->driver_folder))
+		goto exit;
+
+	intf->driver_entry =
+	    rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
+	if (IS_ERR(intf->driver_entry))
+		goto exit;
+
+	intf->chipset_entry =
+	    rt2x00debug_create_file_chipset("chipset",
+					    intf, &intf->chipset_blob);
+	if (IS_ERR(intf->chipset_entry))
+		goto exit;
+
+#define RT2X00DEBUGFS_CREATE_ENTRY(__intf, __name)		\
+({								\
+	(__intf)->__name##_off_entry =				\
+	    debugfs_create_u32(__stringify(__name) "_offset",	\
+			       S_IRUGO | S_IWUSR,		\
+			       (__intf)->driver_folder,		\
+			       &(__intf)->offset_##__name);	\
+	if (IS_ERR((__intf)->__name##_off_entry))		\
+		goto exit;					\
+								\
+	(__intf)->__name##_val_entry =				\
+	    debugfs_create_file(__stringify(__name) "_value",	\
+				S_IRUGO | S_IWUSR,		\
+				(__intf)->driver_folder,	\
+				(__intf), &rt2x00debug_fop_##__name);\
+	if (IS_ERR((__intf)->__name##_val_entry))		\
+		goto exit;					\
+})
+
+	RT2X00DEBUGFS_CREATE_ENTRY(intf, csr);
+	RT2X00DEBUGFS_CREATE_ENTRY(intf, eeprom);
+	RT2X00DEBUGFS_CREATE_ENTRY(intf, bbp);
+	RT2X00DEBUGFS_CREATE_ENTRY(intf, rf);
+
+#undef RT2X00DEBUGFS_CREATE_ENTRY
+
+	return;
+
+exit:
+	rt2x00debug_deregister(rt2x00dev);
+	ERROR(rt2x00dev, "Failed to register debug handler.\n");
+
+	return;
+}
+
+void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
+{
+	const struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
+
+	if (unlikely(!intf))
+		return;
+
+	debugfs_remove(intf->rf_val_entry);
+	debugfs_remove(intf->rf_off_entry);
+	debugfs_remove(intf->bbp_val_entry);
+	debugfs_remove(intf->bbp_off_entry);
+	debugfs_remove(intf->eeprom_val_entry);
+	debugfs_remove(intf->eeprom_off_entry);
+	debugfs_remove(intf->csr_val_entry);
+	debugfs_remove(intf->csr_off_entry);
+	debugfs_remove(intf->chipset_entry);
+	debugfs_remove(intf->driver_entry);
+	debugfs_remove(intf->driver_folder);
+	kfree(intf->chipset_blob.data);
+	kfree(intf->driver_blob.data);
+	kfree(intf);
+
+	rt2x00dev->debugfs_intf = NULL;
+}